Credible reports came through that Syria had used chemical weapons. Whether it's true actually is still open to question, but it's very probably true. At that point, what was at stake was what is called credibility. So if you read the political actors, political leadership, foreign policy commentary, they constantly point out accurately that US credibility was at stake, and we have to maintain US credibility. So therefore something had to be done to show you can't violate our orders.

In a moment of crisis, of which there are all too many, Russian military planners may conclude that lacking a deterrent, the only hope of survival is a first strike - which means the end for all of us.

Markets are lethal, if only because of ignoring externalities, the impacts of their transactions on the environment.

I had relatives in New York City who I stayed with. And in those days, the area from Union Square down Fourth Avenue had small bookstores, many of which were run by Spanish immigrants who'd fled after [Francisco] Franco's victory. I spent time in them, and also in the offices of Freie Arbeiter Stimme (Free Worker's Voice) with anarchists. I picked up a lot of material and talked to people, and it became a major influence.

Free speech has been used by the Supreme Court to give immense power to the wealthiest members of our society.

We can, for example, be fairly confident that either there will be a world without war or there won't be a world - at least, a world inhabited by creatures other than bacteria and beetles, with some scattering of others.

To construct a scientific theory from the data and to be able to recognize that it is a reasonable theory is possible only if there are some very sharp restrictive principles that lead you to go in one direction and not in another direction. Otherwise, you wouldn't have science at all, merely randomly chosen hypotheses.